I think that being able to concede the other player's next shot in match play would be good. I know that concede hole has already been suggested, but say I have a par putt of about 10 feet, and my opponent has a par putt of about a foot. If concede hole was the only option, then he would have to putt or i would lose the hole. If it was possible to concede only the next shot, then time could be saved because he would not have to putt, but I would still have a chance to make par and tie. This could also work in the case of wanting to concede the hole, even from the fairway or earlier.
Also, on a totally unrelated note, it would be nice to be able to turn the ball trail on and off in the replays.